a group of people who have come together for the same purpose

The disgraced minister walked swiftly from the car to his house pursued by a whole posse of reporters. 那个被解职的部长从车里出来飞快地向家里走去，身后追着一大群记者。

in the past, a group of men in the US who were brought together to catch a criminal

The sheriff rounded up a posse and went after the bank robbers. 县治安官召集了一个民防团，追捕银行劫匪。

a group of friends

I was hanging with my posse. 我正和我的一群朋友泡在一起。